Dtc C1251/51 Open In Pump Motor Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

INSPECT SKID CONTROL ECU (GND2 TERMINAL)

RECONFIRM DTC

DTC C1251/51 Open in Pump Motor Circuit


DESCRIPTION


DTC Code
DTC Detection Condition
Trouble Area
C1251/51
When either condition below is met:
  1. Actuator pump motor does not operate properly.
  2. Open in actuator pump motor circuit continues for at least 2 seconds.
  1. Brake actuator assembly (Ground circuit)
  2. Brake actuator assembly (Motor circuit)

WIRING DIAGRAM

Refer to DTCs C0273/13, C0274/14 and C1361/91 (Toyota Fortuner RM000001JD607DX_02.html).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (Toyota Fortuner RM000000XHR02TX.html).
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Select the Active Test mode on the intelligent tester (Toyota Fortuner RM000000XHW080X.html).

    ABS/VSC/TRC
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Motor Relay
    		ABS motor relay
    		Relay ON / OFF
    		Operating sound of motor relay can be heard

  1. Check the operating sound of the ABS motor relay when operating it with the intelligent tester.

    Result
    Result
    		Proceed to
    The operating sound is not heard
    		A
    The operating sound is heard
    		B


B
Go to step 3
A


2.INSPECT SKID CONTROL ECU (GND2 TERMINAL)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1251/51 Open In Pump Motor Circuit

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S25-13 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)
OK


3.RECONFIRM DTC
HINT:
This code is detected when a problem is identified in the brake actuator assembly.
The motor relay is in the brake actuator assembly.
Therefore, motor relay circuit inspection and motor relay unit inspection cannot be performed. Be sure to check if a DTC in output before replacing the brake actuator assembly.

  1. Turn the ignition switch off.

  1. Reconnect the skid control ECU connector.

  1. Clear the DTC(s) (Toyota Fortuner RM000000XHV09NX.html).

  1. Start the engine.

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

  1. Check if the same DTC is recorded (Toyota Fortuner RM000000XHV09NX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC output
    		B
    HINT:
    1. If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the ignition switch ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
    2. If the normal system code is output (a trouble code is not output), slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
    3. If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
    4. The DTCs may be output due to a bad connection at the connector terminal.


B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

USE SIMULATION METHOD TO CHECK